/* ==================== 基础重置 ==================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

:where([id]) {
  scroll-margin-top: 80px;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: var(--white);
  color: var(--text-body);
  font-family: var(--font-cn);
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body:lang(en){font-family:var(--font-en)}

body.nav-open {
  overflow: hidden;
}

h1,
h2,
h3,
p,
blockquote,
figure,
ul,
ol {
  margin-block-start: 0;
}

h1,
h2,
h3 {
  color: var(--text-strong);
  text-wrap: balance;
}

h1,
h2 {
  margin-block-end: clamp(18px, 2vw, 28px);
}

h3 {
  margin-block-end: 10px;
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.35;
}

p,
blockquote {
  margin-block-end: 1em;
}

ul,
ol {
  padding-inline-start: 1.25em;
}

img,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

a {
  color: inherit;
  text-decoration-thickness: .08em;
  text-underline-offset: .2em;
}

button,
input,
textarea,
select {
  color: inherit;
  font: inherit;
}

button,
[role="button"] {
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--brand-300);
  outline-offset: 3px;
}

::selection {
  background: var(--brand-300);
  color: var(--ink-900);
}

/* ==================== 排版尺度 ==================== */
.hero-title {
  font-size: clamp(34px, 5.2vw, 68px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.035em;
}

.section-title {
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.025em;
}

.section-label{margin-block-end:12px;color:var(--brand-text);font-size:13px;font-weight:600;letter-spacing:.08em;line-height:1.5;text-transform:uppercase}

.section-intro {
  max-width: 780px;
  margin-block-end: clamp(28px, 4vw, 52px);
  color: var(--text-body);
}

.text-small{font-size:13px;line-height:1.65}
.text-muted{color:var(--text-muted)}

.text-brand{color:var(--brand-text)}
.text-accent-red{color:var(--accent-red-text)}
.text-accent-amber{color:var(--accent-amber-text)}
.text-accent-blue{color:var(--accent-blue-text)}

.text-center {
  text-align: center;
}

.text-strong {
  font-weight: 700;
}

/* ==================== 布局工具 ==================== */
.container {
  width: min(calc(100% - (var(--gutter) * 2)), var(--maxw));
  margin-inline: auto;
}

.section {
  padding-block: clamp(72px, 9vw, 128px);
  scroll-margin-top: 80px;
}

.section--dark{background:var(--ink-900);color:var(--text-on-dark)}
.section--dark h1,.section--dark h2,.section--dark h3{color:var(--text-on-dark)}
.section--dark .section-intro,.section--dark .text-muted{color:var(--text-on-dark-muted)}

.section--dark .section-label,
.section--dark .text-brand{color:var(--brand-300)}

.section--dark .text-accent-amber{color:var(--accent-amber)}

.section--paper {
  background: var(--paper);
}

.section--white {
  background: var(--white);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2vw, 24px);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
}

.split {
  display: grid;
  align-items: center;
  gap: clamp(32px, 6vw, 80px);
}

.flow-layout {
  display: grid;
  gap: 28px;
}

.flow-layout > li {
  position: relative;
  min-width: 0;
}

.flow-layout article {
  height: 100%;
}

.flow-separator {
  display: none;
}

.horizontal-scroll {
  display: grid;
  grid-auto-columns: minmax(240px, 82vw);
  grid-auto-flow: column;
  gap: 14px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  padding-block-end: 8px;
  scrollbar-width: none;
  scroll-snap-type: inline proximity;
}

.horizontal-scroll::-webkit-scrollbar {
  display: none;
}

.horizontal-scroll > * {
  scroll-snap-align: start;
}

#engine .horizontal-scroll .card{height:100%}

.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: 28px;
}

.spacer-top {
  margin-block-start: clamp(28px, 4vw, 52px);
}

.hero-media {
  margin-inline-end: calc(var(--gutter) * -1);
}

/* ==================== 通用组件 ==================== */
.card{min-width:0;line-break:strict;padding:clamp(20px,2.5vw,32px);border-radius:var(--radius-card);background:var(--white);box-shadow:var(--shadow-card)}

.card--flat {
  box-shadow: none;
}

.card--outlined {
  border: 1px solid var(--card-mint);
  box-shadow: none;
}

.card--large {
  padding: clamp(28px, 4vw, 48px);
  border-radius: 24px;
}

.surface-dark{background:var(--ink-900);color:var(--text-on-dark)}
.surface-dark h3{color:var(--text-on-dark)}
.surface-dark .text-brand{color:var(--brand-300)}
.surface-dark .text-accent-red{color:var(--accent-red)}
.surface-dark .text-accent-amber{color:var(--accent-amber)}
.surface-dark .text-accent-blue{color:var(--accent-blue-on-dark)}

.surface-mint{background:var(--card-mint);color:var(--text-strong)}
.surface-blue{background:var(--card-blue);color:var(--text-strong)}
.surface-rose{background:var(--card-rose);color:var(--text-strong)}
.surface-sand{background:var(--card-sand);color:var(--text-strong)}

/* 深色区浅卡标题 */
:is(.surface-mint,.surface-blue,.surface-rose,.surface-sand,.surface-white) :is(h1,h2,h3,h4){color:var(--text-strong)}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  transition: background-color .2s ease, border-color .2s ease, color .2s ease, transform .2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: var(--brand-500);
  color: var(--ink-900);
}

.button--outline {
  border-color: var(--brand-300);
  background: transparent;
  color: var(--text-on-dark);
}

.button--quiet {
  border-color: var(--card-mint);
  background: var(--white);
  color: var(--text-strong);
}

.chip-list,
.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  padding: 6px 14px;
  border: 1px solid var(--brand-300);
  border-radius: var(--radius-pill);
  font-size: 14px;
  line-height: 1.4;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
}

.banner {
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--radius-card);
  background: var(--ink-900);
  color: var(--text-on-dark);
}

.notice {
  padding: 16px 20px;
  border-radius: 14px;
  background: var(--card-sand);
  color: var(--text-strong);
}

.number-mark {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--brand-500);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 800;
  line-height: 1;
}

.number-mark--pill {
  width: auto;
  padding-inline: 12px;
  border-radius: var(--radius-pill);
}

.stat-number{margin-block-end:10px;color:var(--text-strong);font-family:var(--font-en);font-size:clamp(38px,5vw,64px);font-weight:800;letter-spacing:-.04em;line-height:1;white-space:nowrap}
.stat-number>span:not([data-counter-target]){font-size:.32em;white-space:nowrap}
.stat-number.text-accent-red{color:var(--accent-red-text)}

.surface-dark .stat-number {
  color: var(--text-on-dark);
}

.quote {
  margin-inline: 0;
  font-size: clamp(20px, 2vw, 24px);
  font-weight: 700;
  line-height: 1.5;
}

.quote h3 {
  font-size: clamp(20px, 2vw, 24px);
  line-height: 1.5;
}

.conclusion{margin-block:clamp(28px,4vw,48px) 0;color:var(--brand-text);font-weight:700;text-align:center}
.section--dark .conclusion{color:var(--brand-300)}

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card);
  background: linear-gradient(145deg, var(--ink-700), var(--brand-600));
}

.media-frame--portrait {
  aspect-ratio: 4 / 5;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-caption {
  margin-block: 10px 0;
  color: var(--text-on-dark-muted);
  font-size: 12px;
  line-height: 1.6;
}

.asset-list {
  display: grid;
  gap: 16px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.asset-list li {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 12px;
  align-items: start;
}

.asset-dot {
  width: 10px;
  height: 10px;
  margin-block-start: .55em;
  border-radius: 50%;
  background: var(--brand-300);
}

.asset-dot--amber {
  background: var(--accent-amber);
}

.asset-dot--red {
  background: var(--accent-red);
}

.timeline {
  position: relative;
}

.timeline::before {
  position: absolute;
  inset-block: 10px 10px;
  inset-inline-start: 9px;
  width: 2px;
  background: var(--card-mint);
  content: "";
}

.timeline-item {
  position: relative;
  padding-inline-start: 34px;
}

.timeline-dot {
  position: absolute;
  inset-block-start: 2px;
  inset-inline-start: 2px;
  z-index: 1;
  width: 16px;
  height: 16px;
  border: 3px solid var(--paper);
  border-radius: 50%;
  background: var(--brand-500);
}

.timeline-dot--blue {
  background: var(--accent-blue);
}

.timeline-dot--amber {
  background: var(--accent-amber);
}

.timeline-dot--red {
  background: var(--accent-red);
}

.service-core {
  position: relative;
}

.service-arrow {
  display: none;
  position: absolute;
  inset-block-start: 50%;
  width: 44px;
  border-block-start: 2px dashed currentColor;
  color: var(--brand-500);
}

.service-arrow::after {
  position: absolute;
  inset-block-start: -5px;
  inset-inline-end: 0;
  width: 8px;
  height: 8px;
  border-block-start: 2px solid currentColor;
  border-inline-end: 2px solid currentColor;
  content: "";
  transform: rotate(45deg);
}

.service-arrow--left {
  inset-inline-start: -50px;
}

.service-arrow--right {
  inset-inline-end: -50px;
  color: var(--accent-red);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  inset-block-start: 8px;
  inset-inline-start: 8px;
  z-index: 2000;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--white);
  color: var(--ink-900);
  font-weight: 700;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ==================== 导航外壳 ==================== */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  color: var(--text-on-dark);
  transition: background-color .2s ease, border-color .2s ease;
}

.site-header.is-scrolled {
  border-block-end: 1px solid color-mix(in srgb, var(--white) 14%, transparent);
  background: rgba(12,35,33,.92);
  backdrop-filter: blur(12px);
}

.site-nav {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 24px;
}

.brand {
  flex: 0 0 auto;
  color: var(--brand-300);
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: .18em;
  line-height: 1;
  text-decoration: none;
}

.nav-drawer {
  display: flex;
  min-width: 0;
  flex: 1;
  align-items: center;
  gap: 24px;
}

.nav-drawer__head,
.nav-toggle {
  display: none;
}

.nav-links {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 18px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.nav-links a,
.language-switch a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--text-on-dark-muted);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
}

.language-switch a{min-width:44px;justify-content:center}

.nav-links a:hover,
.nav-links a.is-active,
.nav-links a[aria-current="location"],
.language-switch a:hover,
.language-switch a[aria-current="page"] {
  color: var(--brand-300);
}

.nav-tools,
.language-switch {
  display: flex;
  align-items: center;
  gap: 10px;
}

.language-switch {
  gap: 6px;
}

.language-switch__separator {
  color: var(--text-on-dark-muted);
}

.nav-toggle,
.nav-close {
  width: 44px;
  height: 44px;
  place-items: center;
  padding: 0;
  border: 1px solid var(--brand-300);
  border-radius: 50%;
  background: transparent;
  color: var(--text-on-dark);
}

.nav-close {
  display: grid;
}

.nav-toggle svg,
.nav-close svg {
  width: 22px;
  height: 22px;
}

/* ==================== 入场状态 ==================== */
@media (prefers-reduced-motion: no-preference) {
  [data-reveal].is-reveal-pending {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity .55s ease, transform .55s ease;
  }

  [data-reveal].is-reveal-pending.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== 小屏导航：小于 1024px ==================== */
@media (max-width: 1023px) {
  .site-header:not(.nav-enhanced) {
    position: relative;
    background: var(--ink-900);
  }

  .site-header:not(.nav-enhanced) .site-nav {
    flex-wrap: wrap;
    padding-block: 14px;
  }

  .site-header:not(.nav-enhanced) .nav-drawer {
    width: 100%;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .site-header:not(.nav-enhanced) .nav-links,
  .site-header:not(.nav-enhanced) .nav-tools {
    flex-wrap: wrap;
    margin: 0;
  }

  .site-header.nav-enhanced .nav-toggle {
    display: grid;
    order: 3;
  }

  .site-header.nav-enhanced .nav-drawer {
    position: fixed;
    inset: 0;
    z-index: 1100;
    min-height: 100dvh;
    overflow-y: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 28px;
    padding: 18px var(--gutter) 32px;
    background: var(--ink-900);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  }

  .site-header.nav-enhanced .nav-drawer.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
    visibility: visible;
  }

  .site-header.nav-enhanced .nav-drawer__head {
    display: flex;
    min-height: 44px;
    align-items: center;
    justify-content: space-between;
  }

  .site-header.nav-enhanced .nav-links {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
  }

  .site-header.nav-enhanced .nav-links a {
    min-height: 52px;
    font-size: 18px;
  }

  .site-header.nav-enhanced .site-nav > .nav-tools {
    order: 2;
    margin-inline-start: auto;
    gap: 6px;
  }

  .site-header.nav-enhanced .site-nav > .nav-tools .button {
    display: inline-flex;
    width: auto;
    white-space: nowrap;
  }
}

@media (max-width: 479px) {
  .site-header.nav-enhanced .site-nav {
    gap: 6px;
  }

  .site-header.nav-enhanced .site-nav > .nav-tools {
    gap: 2px;
  }

  .site-header.nav-enhanced .site-nav > .nav-tools .language-switch a[aria-current="page"],
  .site-header.nav-enhanced .site-nav > .nav-tools .language-switch__separator {
    display: none;
  }

  .site-header.nav-enhanced .site-nav > .nav-tools .button {
    padding-inline: 7px;
    font-size: 11px;
  }
}

/* ==================== 移动端：小于 768px ==================== */
@media (max-width: 767px) {
  :root {
    --gutter: 18px;
  }

  .section-actions .button {
    flex: 1 1 180px;
  }
}

/* ==================== 平板：768px–1199px ==================== */
@media (min-width: 768px) and (max-width: 1199px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-layout {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .flow-separator {
    position: absolute;
    inset-block-start: 50%;
    inset-inline-end: -20px;
    display: grid;
    width: 12px;
    place-items: center;
    color: var(--brand-500);
    font-family: var(--font-en);
    font-size: 28px;
    line-height: 1;
    transform: translateY(-50%);
  }

  .timeline.grid--4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .timeline::before {
    inset: 7px 8% auto;
    width: auto;
    height: 2px;
  }

  .timeline-item {
    padding: 34px 0 0;
  }

  .timeline-dot {
    inset-block-start: 0;
    inset-inline-start: 24px;
  }

  .nav-links {
    gap: 10px;
  }

  .nav-links a {
    font-size: 12px;
  }

  .horizontal-scroll {
    grid-auto-flow: row;
    grid-auto-rows: 1fr;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    overflow: visible;
  }
}

/* ==================== 桌面：大于等于 1200px ==================== */
@media (min-width: 1200px) {
  .grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .grid--4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split--55-45 {
    grid-template-columns: 11fr 9fr;
  }

  .hero-media {
    margin-inline-end: min(calc(var(--gutter) * -1), calc(600px - 50vw));
  }

  .flow-layout {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }

  .flow-separator {
    position: absolute;
    inset-block-start: 50%;
    inset-inline-end: -20px;
    display: grid;
    width: 12px;
    place-items: center;
    color: var(--brand-500);
    font-family: var(--font-en);
    font-size: 30px;
    line-height: 1;
    transform: translateY(-50%);
  }

  .timeline::before {
    inset: 7px 8% auto;
    width: auto;
    height: 2px;
  }

  .timeline-item {
    padding: 34px 0 0;
  }

  .timeline-dot {
    inset-block-start: 0;
    inset-inline-start: 24px;
  }

  .service-arrow {
    display: block;
  }

  .horizontal-scroll {
    grid-auto-flow: row;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    overflow: visible;
  }
}

/* ==================== 减少动态效果 ==================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}